The Winchester-King's Somborne Syncline is one of a series of parallel east-west trending folds in the Cretaceous chalk of Hampshire.
It lies at the western end of the South Downs, immediately to the north of the Winchester-East Meon Anticline and east of Salisbury Plain.
Parallel folds to the north include the Stockbridge Anticline and the Micheldever Syncline.
As with other nearby folds, the structure is controlled by movement of fault blocks within the Jurassic strata below.
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